1143909194 has 4 divisors (see below), whose sum is σ = 1715863794. Its totient is φ = 571954596.

The previous prime is 1143909191. The next prime is 1143909233. The reversal of 1143909194 is 4919093411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4919093411 = 40189 ⋅122399.

It can be written as a sum of positive squares in only one way, i.e., 1009650625 + 134258569 = 31775^2 + 11587^2 .

It is not an unprimeable number, because it can be changed into a prime (1143909191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 285977297 + ... + 285977300.

Almost surely, 2^1143909194 is an apocalyptic number.

1143909194 is a deficient number, since it is larger than the sum of its proper divisors (571954600).

1143909194 is an equidigital number, since it uses as much as digits as its factorization.

1143909194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571954599.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 1143909194 is about 33821.7266561008. The cubic root of 1143909194 is about 1045.8366334878.

The spelling of 1143909194 in words is "one billion, one hundred forty-three million, nine hundred nine thousand, one hundred ninety-four".